<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>字符翻转</title>
</head>
<body>
    

    <script>
       function stringReverse (str) {
           return str.split("").reverse().join("");
       }

       var s = "abcdefghijklmn";

       console.log(stringReverse(s));
    
    </script>
</body>
</html>